Renal scintigraphy performed immediately after the patient had sudden onset of scrotal swelling and anuria. (A) Initial blood flow images (2 sec/frame) show normal renal perfusion. Here the summed flow images are shown. (B) On subsequent 30-min functional images were obtained. Here the summed functional images demonstrate the transplant kidney showing normal perfusion and function with excretion of radiotracer into the renal collecting system and a focal collection mimicking the urinary bladder (arrows). There is a vertically oriented accumulation of radioactivity inferior to the pelvis (arrow head).